19988012544 has 80 divisors (see below), whose sum is σ = 53602581120. Its totient is φ = 6618470400.

The previous prime is 19988012509. The next prime is 19988012567. The reversal of 19988012544 is 44521088991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188847 + ... + 275025.

It is an arithmetic number, because the mean of its divisors is an integer number (670032264).

Almost surely, 2^19988012544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19988012544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26801290560).

19988012544 is an abundant number, since it is smaller than the sum of its proper divisors (33614568576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19988012544 is an equidigital number, since it uses as much as digits as its factorization.

19988012544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86351 (or 86335 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 19988012544 in words is "nineteen billion, nine hundred eighty-eight million, twelve thousand, five hundred forty-four".